Belt driving mechanism.



H. ALLEN.

BELT DRIVING MECHANISM.

APPLICATION FILED NOV 10. 1910.

Patented Dec. 22, 1914.

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Warm/war H. ALLEN. BELTDRIVING MECHANISM. APPLICATION FILED NOV. 10, 1910.

Patented Dec. 22, 1914.

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H. ALLEN.

BELT DRIVING MECHANISM.

APPLICATION FILED NOV. 10. 1910.

1, 121,599. Patented Dec. 22, 1914.

3 SHEETS-SHEET 3.

THE NORRIS PETERS cc. FHOTOILITHOH WASHINb TON. D C

Belt Driving Mechanism,

' for practising ent. speeds from a power step :pulley.

U T S ES A'IENT FF CE HARDING ALLEN, or Briana: MASSACHUSETTS."

, BELT DRIVING MnonAmsM.

To all whom'it may c0nce1'n: Be it known that I, HARDING ALLEN, a c tizen of the United States,residing at Barre, in the county of Worcester sachusetts, have invented a new and useful lowing is ,aspecification.

The object of this invention is to provide a new and improved'belt driving mechanism by which power can be transmitted at differshaft. a

The invention, while capableof general use, has been devised particularly for use in connection with machinetools, such as drilling machines, which havea vertical spindle.

The best form of apparatus known to me the invention is shownin the accompanying three'sheets of drawings-1n which,

Figure 11s aside elevation of a, drillingv machine or parts with my improved belt driving gearing applied thereto. .Fig. 2 lsa rear elevation onan enlarged scale of'the power shaft and driving shaft. .Fig. is a side elevation of the parts shown in Fig. 2. Fig.4 is a side partial view, similar to Fig. 4, showing the parts in a difierentposltion. F g. 6 isa plan of the parts shown inFig.. 4, and Fig. 7

diagrammatic view illustratlng the operation. a

Referring to the drawings and indeta l, A designates the frame of the drlll-press, which frame has the usual table or support adjustably mounted thereon. A head or carrier B isadjustably mounted on the frame of the machine and mounted axially adjust-j able therein is a qulll C in whichis'journaled the drill spindle D, which, in the particular machine, forms the driven shaft to which power is to I is adjustably mounted at the top of. the frame. J ournaledon' top of this carrier is a paratus shown, g

This pulley F 1s. arranged to drive the drill spindle 'D in any approved way, the drill spindle being vertically adjustable through the pulley F for thepurpose of the feed. I

The parts previously descrlbed maybe .of any ordinary or approved constructlon. L The carrier E may be adjusted vertically to either one of two positions, as shown Specification of Letters Patent.

and State of Masof which the fol-. p

' i slide hori'zontallyon which is a plate 13. l Mounted inlorackets carried by'the plate1l3 shaft to a driven 12 by means of .a screw ed into a nut 21 depending from the plate,

elevation on an enlarged. scale of the top of the machine. F 1g. 5 1s a be applied. .A:'carrier E sitionp p Patented Dec. 22, 1914. 1 Application filed. Rovember 10, 1910. Serial No. 591,595.

inFigs. 4. and 5, by means ofa pivoted bell.- & 1 crank lever 10 and link 11 so as to bring eithers'tep of the pulley F into operative poy i 160 -Extending rearwardlv from the frame is a supporting arm.,orbracket 12, fitted'to is'a shaft on which a quarter turn idler pulley G, runs. Pivoted tothe plate l3 is a bracket 14 which carries. ashafton which an idler H runs. Extending fromv this bracket 1- 14 is an arm which has a pin 151engaginga slot jin'acam-16. This cam has slots at its ends through which pass screws 17 17 threaded into the. frame, these parts being so arranged that the cam'can slide back and,

forth on theQplate A-bell-crank lever 18 is pivoted in the frame of the machine and has one end connected to the.adj-ust' able carrier E andthe other end totsaid back and forth onuthe bracket be adjusted 20 which. is thread-' cam 16 by a link 19. The plate 18 can and which screw can be operated by means of bevel gears 2222 and a hand wheel 23. -The general purposeof this construction is to keep the idler H automatically in proper position to deliver the quarter turn belt, hereinafter referred to, prop erly to the pulley F, and to either step there- -of,,depending upon the vertical adjustment ofwthe carrier E; and also to keep the return idler inproperv position as the plate 13 is adjusted horizontally by the hand wheel 23 to put the quarter turnbelt under the right tension for thework being done. The general details of this mechanism are shown, described and claimed in my Patent No. 962,690, dated une. 28,1910.

I designates the power shaft to which I 7 power may be applied by means of loose and tight pulleys 24 and 25. This shaft 1 may. extend along horizontally so. that the same shaft can'be used. to impart power to a num- I ber of vertically driven shafts. or drill spinpulley J:which preferably is made in the form of a step cone, thr'e'esteps'being shown in the construction illustrated.

K designates a driving shaft. This shaft dles. Mounted on the power shaft I isa isjournaled in arms 26 26. These arms;

are pivoted on'a shaft 27 which is fixed in the. framing,

ward motion of the driving shaft. Mounted.

a stop 28 limiting the down- 9 I on thedriving shaftK-is pulleyqL, and a quarter turnbelt M extends from said pul.

, ley L on the driving shaft around said idlers to thepulley F on the driven shaft. A sec ond pulley N is mounted on the movable driving shaft K and this, pulley is prefer ab'ly made to-have three steps so that a belt can be used to take the power from'the pul- I ley J'onthe power shaft I to this pulley N,

justing thebelt O to different step pulleys J and N, three different speeds Y can beflobtained and the total number of and so that the belt can be adjusted to ob- 'tain different speeds between these two pul-' I leysh. By this arrangement,-, six different H speeds can be obtained that is to say, byadjusting. the quarter turn beltM tojrunto either step of the driven pulley F, two different speeds can be obtained, and by ad speeds possibleis theproduct of these two numbers, or siX-diiferentspeeds. By prop-'- erly-designing the pulleys, a pr'o'gressive/se- -ries of speeds can be obtained,,which isde- I 1 sirable for operating machines of the class.

. tained for any class of work. I

referred to, so that proper speeds may be ob When an adjustment is to bemade, the

4 hand'wheel 23 is moved so as to adjustthe quarter-z turn idlers G. and H'to relieve the tension on the quarter turn belt M. This-at thesame time will relieve the tension on the i belt 0. Usually, in making a new belt adjustment, the-quarter turn idlers G and H 'wardly until the driving shaft Ii in QM "can beadjusted to either step of the '40 are movedfar enough toward thespindle to allow the driving shaft K to swing down pivoted arms 26 engage-the This engagement will hold the position where the belt stop- 28.

driven pulley 1* without any drag from the weight of said driving shaft K and the'parts supporting the same and mounted thereon,

, It also will be noted that when the driving shaft is in this lowered supportedpositiomthe tension on the belt 0 will be relieved so that anew belt adjustment can be easily made between the power shaft land the driving shaft K. The new adjustment desired can be made by moving thecarrier E quarter turn belt being/put under tension will pull up on the pulley N and thus will;

pull upon the movable driving shaft K,

v which action will put the other belt 0 un r der tension.

It will be noticed that the center of movement of the driving shaft K is the center of the shaft 27 and that as the positions on belts are put un der anaemia driving shaft 5 K will be constrained to swing on-an arc struck about the center of the shaft 27, as

illustrated in, Fig. 7 This willgive a to'g gling or increased leverage movement between the power. shaft Iand'the driving shaftK. Inother words, the togglinge'ffect will be obtained-by .the movement of the driving shaft K on the arc a struck around the center 27, as opposed to" the normal swinging'movement of said shaft K on an arc b struck-around the center of'the shaftI;

The result of this construction is that the lower or first belt O-will be put under a; heavier tension; thanthe quarter turnbelt This is a very desirable *feature, partic'ularly when the belt O is running I from,

the small step on the pulley J to the large step on the pulley N, becausethe' tension of v the belt 0 can be so increased, relatively-to the tension of the belt M, that the beltfOQ' willnot slip. This adjustment is usually are obtained when the belt is onthe small made when the spindle is driving alarge:

drill or tool requiring aslowerspeed and a I great deal of power. This. increased tension 7 on the belt 0 overcomes -the-efi ecti of the de crease in the surface-wrap due tothe difference in the size of the pulleys-and to the shortness of the belt. The same advantages step of the pulley J. When anadjustment is to bemade, all that is necessary {is to manipulate the hand wheel 23 to "adjust the idlers to relieve the tensionofb'oth belts, to

make theproper adjustment, and then to adjust the hand. wheel 23 to move the idlers rearwardly, which will put both belts under tension and which will putthe lowerfbelt under a greater tension than the upper belt, which will give proper belt drive,

even if the machine is required to do heavy work.

cations specified.

The details and arrangements herein Thus, a gearing is provided which'is .r particularly advantageous for use in theloj fied by a skilled mechanic without departing from-the scope of my invention as expressed in the claim. 1

Having thus fully "described I invention, what I claim and desire to secure by Letters-Patent is Ina machine tool, in combinationa frame, l a power shaft mounted horizontally in. said".

, framefa driven shaft mounted vertically in said frame, an intermediate shaft niovably supported in horizontal position above 7 and to the rear of'said power shaft a pair. of swingingarms pivoted tov said frame at points located substantially in the vertical plane of said power shaft andsubstanti-ally. I in the horizontal plane ofsaid' intermediate shaft, a pulley on said power shaft,'a pulley;

on said intermediate shaft, a short belt running over said pulleys and thereby driving 110 j shown and described may be greatly modisubstantially vertically from. the driving said intermediate shaft from said power shaft, a driving pulley onsaid intermediate shaft, a pulley on said vertical shaft, a pair of idler pulleys mounted substantially vertically above said intermediate shaft and substantially in the plane of the pulley upon the vertical shaft in position to guide a belt running from the driving pulley upon the intermediate shaft to the pulley upon the vertical shaft, a quarter-turn belt passing pulley on said intermediate shaftto. the idler pulleys and from said idler pulleys to the pulley on said vertical shaft, and means to tightensaid quarter-turn belt, the angular position of said idler pulleys, said intermediate shaft and said power shaft being such that tightening of the quarter-turn belt is also effective to tighten the short belt in greater degree.

In testimony whereof I have hereunto set my hand, in the presence of two subscribing witnesses. v

HARDING ALLEN.

Witnesses: C. Fonnns'r Wesson,

E. M. ALLEN.

Copies of this patent may be o'btained o -five cents each, by addressing the Commissioner of i latents,

, Washington, D. 0.? i 

